Trustonic

technology

SeniorUIDeveloper

Winnersh, United Kingdom FULL TIME Remote Friendly
Market Sentiment
HIGH DEMAND

Neural analysis suggests this role is
optimal for mid candidates.

The Brief

“Senior UI Developer at Trustonic. Skills: React 18, TypeScript, GraphQL, AWS AppSync, Cognito, Ant Design, Jest, React Testing Library. Build Modern Web Experiences. Design, develop, and maintain a React 18-based operator portal, delivering responsive and intuitive user interfaces.”

What You'll Achieve.

deliver seamless, scalable solutions; shape the user experience across a complex SaaS platform; translating sophisticated platform capabilities into elegant, usable interfaces for customers; delivering responsive and intuitive user interfaces; ensuring consistency and reusability across the platform; deliver secure, real-time user experiences; Optimise applications for speed and scalability; Ensure applications meet high standards for responsiveness, cross-browser compatibility, and accessibility

Industry & Context.

technology
Eligibility Requirements

attendance required at our office in Winnersh from time to time

What They're Looking For.

Must Have

commercial experience building production-grade React applications, Proven experience working with GraphQL APIs (AppSync, Apollo, or similar), Experience implementing authentication flows (e.g., AWS Cognito, OAuth2/OIDC), Solid experience using TypeScript in a React codebase, Deep understanding of React 18 (hooks, context, performance optimisation), skills in TypeScript, including generics and scalable typing patterns, Experience with modern tooling such as Vite or equivalent, Knowledge of state management patterns (React Query, Zustand, or similar), CSS/SCSS skills including responsive design (flexbox, grid), Experience with testing frameworks like Jest and React Testing Library, A degree in computer science, software engineering, or equivalent experience

Nice to Have

Experience with multi-tenant SaaS platforms at scale, Familiarity with AWS services (AppSync, Cognito, S3, CloudFront), Understanding of web performance optimisation techniques, Awareness of accessibility standards (WCAG), Experience working with design systems and UX best practices, AWS certification is desirable but not essential

What You'll Do.

Build Modern Web Experiences

and maintain a React 18-based operator portal

delivering responsive and intuitive user interfaces.

Create Reusable UI Components

Develop and maintain scalable component libraries using Ant Design

ensuring consistency and reusability across the platform.

Integrate with Cloud Services

Work with AWS AppSync GraphQL APIs and Cognito authentication flows to deliver secure

real-time user experiences.

Own State & Data Management

Implement efficient data-fetching and state management patterns (e.g.

Zustand) for real-time device data.

Drive Frontend Performance

Optimise applications for speed and scalability through code-splitting

and caching strategies.

Collaborate Across Teams

Partner with backend engineers on API design and schema evolution

and contribute to UX and design discussions.

Ensure Quality & Reliability

Write robust unit and integration tests using Jest and React Testing Library

and contribute to code reviews and best practices.

Champion User Experience & Accessibility

Ensure applications meet high standards for responsiveness

cross-browser compatibility

How You'll Work.

Team & Collaboration

collaborating closely with backend engineers and product teams; Collaborate Across Teams; Partner with backend engineers on API design and schema evolution; contribute to UX and design discussions; Comfortable working across teams and contributing to shared solutions

Full Job Description

Who we are... At Trustonic, we make smartphones affordable for the many, enabling global access to devices and digital finance through the world’s most secure smartphone locking technology. We partner with mobile carriers, retailers, and financiers across 30+ countries, powering device financing solutions that drive economic inclusion, profitability, and growth. We pride ourselves on living by the Trustonic culture code, a blueprint for our journey that recognises that great working environments don’t guarantee success, but bad ones almost always ensure failure. Working here, you’ll find a company that celebrates its diversity and is looking to do the right thing: for each other, the community and the planet. We believe in equal opportunities and take to heart the old African proverb ’If you only want to go fast, go alone. If you want to go far, go together’. We work flexibly when and where we’re at our best, but regardless of how you choose to work, we’ll make sure you feel like one of the team. Click [here ](https://www.trustonic.com/wp-content/uploads/2022/03/Trustonic-culture-code-Oct-2021.pdf)if you would like to find out more about Trustonic's culture code. If you would like to work in a fast-moving global technology company, with great ambition, then we’d love to hear from you! A bit about the role and what you’ll do… We’re looking for a Senior UI Developer to take a leading role in building and evolving our operator web portal for a next-generation telecoms platform. You’ll create intuitive, high-performance user interfaces that power device lifecycle management at scale—working at the intersection of frontend engineering, real-time data, and secure cloud integrations. This is a high-impact role where you’ll shape the user experience across a complex SaaS platform, collaborating closely with backend engineers and product teams to deliver seamless, scalable solutions. You’ll play a key role in translating sophisticated platform capabilities into elegant, usab

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